/**
 * Copyright 2010, BigDataCraft.com
 * 
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * 
 * http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package dremel.dataset;

/**
 * A read-only iterator to nested columnar dataset.
 * <P>
 * A tree of column reader as mentioned in dremel paper. Tree is polymorphic to schema.
 *
 */
public interface ReaderTree {
	//TODO Extract interface from old flat drmel project Drec.ScannerFacade
}
